If $\Delta U$ and $\Delta W$ represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true?

  • [AIPMT 1998]
  • [AIPMT 2010]
  • A

    $\Delta U = - \Delta W$ in an adiabatic process

  • B

    $\Delta U = \Delta W$ in an isothermal process

  • C

    $\Delta U = - \Delta W$ in an isothermal process

  • D

    $\Delta U = \Delta W$ in an adiabatic process

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  • [AIPMT 2010]